Conversion efficiency of strained wurtzite In x Ga 1−x N/ZnSnN 2 core/shell quantum dot solar cells under external electric field

In this study, the conversion efficiency (CE) , open-circuit voltage ( V OC ) and short-circuit current density ( J SC ) of wurtzite In x Ga 1−x N/ZnSnN 2 core/shell quantum dot (QD) solar cells are studied by using the detailed balance model. The effects of strain and external electric field have been considered. The results show that with the increase of the core size, the V OC increases, while the J SC and CE decrease. With the increase of shell size or In content, the V OC decreases, while the J SC and CE increase. In addition, our calculations show that the band gap of QD increases due to strain, which leads to an increase of the V OC , but decreases of the CE and J SC . By contrast, the situation is opposite under the effect of external electric field.